// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
namespace Roslyn.LanguageServer.Protocol;
 
using System;
using System.Text.Json.Serialization;
 
/// <summary>
/// Response class when asking server to resolve the rendering information of a string kind.
/// </summary>
internal sealed class VSInternalIconMapping : IEquatable<VSInternalIconMapping>
{
    /// <summary>
    /// Gets or sets the ImageElements for a certain kind.
    /// </summary>
    [JsonPropertyName("_vs_images")]
    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
    public VSImageId[]? Images
    {
        get;
        set;
    }
 
    /// <summary>
    /// Gets or sets the tags for a certain kind. To be used in the absence of ImageIds.
    /// </summary>
    [JsonPropertyName("_vs_tags")]
    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
    public string[]? Tags
    {
        get;
        set;
    }
 
    /// <inheritdoc/>
    public override bool Equals(object? obj)
    {
        return this.Equals(obj as VSInternalIconMapping);
    }
 
    /// <inheritdoc/>
    public bool Equals(VSInternalIconMapping? other)
    {
        if (other == null)
        {
            return false;
        }
 
        return CheckImagesAreEqual(this.Images, other.Images) && CheckTagsAreEqual(this.Tags, other.Tags);
    }
 
    /// <inheritdoc/>
    public override int GetHashCode()
    {
        var hashCode = 1825600323;
 
        if (this.Images != null)
        {
            for (var i = 0; i < this.Images.Length; i++)
            {
                hashCode = (hashCode * -1521134295) + this.Images[i].Guid.GetHashCode();
                hashCode = (hashCode * -1521134295) + this.Images[i].Id.GetHashCode();
            }
        }
 
        if (this.Tags != null)
        {
            for (var i = 0; i < this.Tags.Length; i++)
            {
                hashCode = (hashCode * -1521134295) + StringComparer.Ordinal.GetHashCode(this.Tags[i]);
            }
        }
 
        return hashCode;
    }
 
    private static bool CheckImagesAreEqual(VSImageId[]? current, VSImageId[]? other)
    {
        if (current == null ^ other == null)
        {
            return false;
        }
 
        if (current != null &&
            other != null &&
            current.Length == other.Length)
        {
            for (var i = 0; i < current.Length; i++)
            {
                if (current[i].Id != other[i].Id)
                {
                    return false;
                }
 
                if (current[i].Guid != other[i].Guid)
                {
                    return false;
                }
            }
        }
 
        return true;
    }
 
    private static bool CheckTagsAreEqual(string[]? current, string[]? other)
    {
        if (current == null ^ other == null)
        {
            return false;
        }
 
        if (current != null &&
            other != null &&
            current.Length == other.Length)
        {
            for (var i = 0; i < current.Length; i++)
            {
                if (!string.Equals(current[i], other[i], StringComparison.Ordinal))
                {
                    return false;
                }
            }
        }
 
        return true;
    }
}